Nor was cowardice the only charge of which Ethelred was guilty. To this must be added treachery and murder. In the year 1002, when he married the daughter of the Duke of Normandy, hoping thereby to win the Duke's friendship and to close the harbours on the French coast against Sweyn, Ethelred issued secret orders for a massacre of all Danes found in England. In this massacre, which took place on the Festival of St. Brice (13th Nov.), perished Gunhild, sister of Sweyn. Under these circumstances, it can scarcely be wondered at, that thenceforth the Danish invasions became more frequent, more systematic, and more extensive than ever.
For four years they continued their depredations "cruelly marking every shire in Wessex with burning and with harrying." Then they were again bought off with a sum of £36,000, and two years' respite (1007-8) was gained.(41) It was a respite and no more. As soon as they had spent their money, they came again, and in 1009 made several assaults on London--"They often fought against the town of London, but to God be praise that it yet stands sound, and they have ever fared ill."(42) Every year they struck deeper into the heart of the country, and carried their plundering expeditions from Wessex into Mercia and East Anglia.
In 1011 Canterbury was taken and sacked, Alphage, the Archbishop, being made prisoner, and carried away by the Danish fleet to Greenwich. Finding it impossible to extort a ransom, they brutally murdered him (19th May, 1012), in one of their drunken moods, pelting him in their open court or "husting" with bones and skulls of oxen.(43) The worthy prelate's corpse was allowed to be removed to London where it was reverently interred in St. Paul's. A few years later, Cnut caused it to be transferred with due solemnity to the Archbishop's own metropolitan church of Canterbury.
In the following year, Sweyn was so successful in reducing the Northumbrians and the inhabitants of the five boroughs,(44) as well as the towns of Winchester and Oxford, taking hostages from each as he went, that he thought he might venture once more to attack London itself; hoping for better success than had attended him on previous occasions. He was the more anxious to capture London, because Ethelred himself was there, but he again met with such determined resistance, and so many of his followers were drowned in the Thames that for the fourth time he had to beat a retreat.(45)